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"nanometer" or billionths of a meter.

650 nanometers is the wavelength of the light produced by the diode.

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Q: What does the nm in 650nm laser diode mean?
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How do dvds hold more memory than cds?

DVD uses 650nm wavelength laser diode light as opposed to 780 nm for CD or 405 nm for HD-DVD or Blu-ray Disc. This permits a smaller pit to be etched on the media surface (1.32 µm for DVD versus 1.6 µm for CD) compared to CDs.


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Light at 489 nanometers is in the blue area of the spectrum. Use the link below for more information.


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